POSSIBLE EVIDENCE FOR ENHANCED ΔS = 0, ΔT = 2 WEAK INTERACTION IN PARITY MIXING IN NUCLEI

Publisher Summary This chapter explores the possible evidence for enhanced Δ S = 0, Δ T = 2 weak interaction in parity mixing in nuclei. The experiment on the α decay of the 2 − state at 8.88 MeV in 160 is in essential agreement with the calculations using a standard potential. This experiment is sensitive only to the Δ T = 0 term in the potential and, therefore, fixes it to be in the vicinity of that of the standard potential. Obtaining agreement with the datum by enhancement of the Δ T =0 term requires an enhancement of 10 3 .However, the Δ T = 2 part by a factor of about 30 can be enhanced and agreement for n + p → d + γ can be obtained without disturbing the agreement found in 16 0 and 19 F. The Δ T = 2 potential can be adjusted to obtain the correct sign for the circular polarization. There is an experimental limit on the parity mixing in p–p scattering at 15 MeV. This is just consistent with enhanced Δ T =2 potential, but if lowered significantly, it would exclude the potential in its present form.